Segment Information - Reconciliation of Partnership Adjusted EBITDA (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Mar. 31, 2017	Mar. 31, 2016		Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information
Depreciation and amortization		$ (99.3)	$ (100.7)	[1]	$ (197.4)	$ (201.3)	[1]
Interest expense		(55.8)	(57.3)	[1]	(111.2)	(115.2)	[1]
Loss on extinguishments of debt		(22.1)	0.0		(55.3)	0.0
Income before income taxes		$ 436.4	$ 558.1	[1]	$ 815.1	$ 805.6	[1]
General Partnership interest in AmeriGas OLP (percentage)		1.01%	1.01%		1.01%	1.01%
Operating Segments | Amerigas Propane
Segment Reporting Information
Partnership Adjusted EBITDA	[2]	$ 271.2	$ 295.4	[1]	$ 456.3	$ 473.1	[1]
Depreciation and amortization		(45.0)	(47.4)	[1]	(89.6)	(96.6)	[1]
Interest expense		(40.0)	(40.8)	[1]	(80.0)	(81.8)	[1]
Loss on extinguishments of debt		(22.1)	0.0		(55.3)	0.0
Noncontrolling interest	[3]	1.1	2.4		2.5	3.5
Income before income taxes		$ 165.2	$ 209.6	[1]	$ 233.9	$ 298.2	[1]

[1] Restated to reflect (1) the current-year changes in the presentation of our UGI International and Midstream & Marketing reportable segments and (2) the adoption of new accounting guidance related to debt issuance costs (see Note 2).

[2] The following table provides a reconciliation of Partnership Adjusted EBITDA to AmeriGas Propane income before income taxes: Three Months EndedMarch 31, Six Months EndedMarch 31, 2017 2016 2017 2016Partnership Adjusted EBITDA $271.2 $295.4 $456.3 $473.1Depreciation and amortization (45.0) (47.4) (89.6) (96.6)Interest expense (40.0) (40.8) (80.0) (81.8)Loss on extinguishments of debt (22.1) — (55.3) —Noncontrolling interest (i) 1.1 2.4 2.5 3.5Income before income taxes $165.2 $209.6 $233.9 $298.2(i)Principally represents the General Partner’s 1.01% interest in AmeriGas OLP.

[3] Principally represents the General Partner’s 1.01% interest in AmeriGas OLP.